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    <p>I wasn't able to solve the issue of using <code>onProgress</code> on the compressed content itself, but I came up with this semi-simple workaround. <strong>In a nutshell</strong>: send a <code>HEAD</code> request to the server at the same time as a <code>GET</code> request, and render the progress bar once there's enough information to do so.</p> <hr> <pre><code>function loader(onDone, onProgress, url, data) { // onDone = event handler to run on successful download // onProgress = event handler to run during a download // url = url to load // data = extra parameters to be sent with the AJAX request var content_length = null; self.meta_xhr = $.ajax({ url: url, data: data, dataType: 'json', type: 'HEAD', success: function(data, status, jqXHR) { content_length = jqXHR.getResponseHeader("X-Content-Length"); } }); self.xhr = $.ajax({ url: url, data: data, success: onDone, dataType: 'json', progress: function(jqXHR, evt) { var pct = 0; if (evt.lengthComputable) { pct = 100 * evt.position / evt.total; } else if (self.content_length != null) { pct = 100 * evt.position / self.content_length; } onProgress(pct); } }); } </code></pre> <p>And then to use it:</p> <pre><code>loader(function(response) { console.log("Content loaded! do stuff now."); }, function(pct) { console.log("The content is " + pct + "% loaded."); }, '&lt;url here&gt;', {}); </code></pre> <hr> <p>On the server side, set the <code>X-Content-Length</code> header on both the <code>GET</code> and the <code>HEAD</code> requests (which should represent the <em>uncompressed</em> content length), and abort sending the content on the <code>HEAD</code> request. </p> <p>In PHP, setting the header looks like:</p> <pre><code>header("X-Content-Length: ".strlen($payload)); </code></pre> <p>And then abort sending the content if it's a <code>HEAD</code> request:</p> <pre><code>if ($_SERVER['REQUEST_METHOD'] == "HEAD") { exit; } </code></pre> <hr> <p>Here's what it looks like in action:</p> <p><img src="https://i.stack.imgur.com/UkqS8.png" alt="screenshot"></p> <p>The reason the <code>HEAD</code> takes so long in the below screenshot is because the server still has to parse the file to know how long it is, but that's something I can definitely improve on, and it's definitely an improvement from where it was.</p>
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    1. POHow can I use deflated/gzipped content with an XHR onProgress function?
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    1. USJimmy Sawczuk
    1. USJimmy Sawczuk
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    1. POHow can I use deflated/gzipped content with an XHR onProgress function?
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    1. CONow you have 2 HTTP requests that need to succeed. Is unlikely but statistically it does increases the probability of a broken page. Plus you have a custom HTTP header that may confuse people that come here to copy/paste the code to solve the same problem. If you want decoupling that bad better use GET params you can extract with JS: `download.html?file=data.json&size=6666`
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      1. USIvan Castellanos
    2. CO@IvanCastellanos if the `HEAD` request fails it's not a big deal, and if the `GET` request fails I'm no better off than before. I could theoretically set the normal `Content-Length` header but it might be misrepresentative of what's actually being sent on the `HEAD` request, so the custom one is more appropriate. (I could probably clarify that part of my answer.) I don't follow how your `GET` parameters address my problem either.
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      1. USJimmy Sawczuk
    3. COThe link to the download page would always contain the info of the "Content-length" making it way more portable solution (don't need php script plus one less HTTP request). `content_length=document.location.href.match(/(?:size=)(\d+)/)[1]|0;`
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